linux - 如果通过 NFS 安装，为什么 proc 文件系统是空的

Question

我很好奇是否可以显示通过网络挂载的/proc 虚拟文件系统的内容。所以我导出“/”并通过 NFS 将其安装在另一个系统中。然后我 cd 进入 proc 目录并执行 ls。它什么也没显示。有人请解释为什么它是空的。

Answer 1

请阅读man 5 exports:

   nohide This option is based on the option of the same name provided  in
          IRIX  NFS.  Normally, if a server exports two filesystems one of
          which is mounted on the other, then  the  client  will  have  to
          mount  both filesystems explicitly to get access to them.  If it
          just mounts the parent, it will see an empty  directory  at  the
          place where the other filesystem is mounted.  That filesystem is
          "hidden".

默认情况下，客户端看不到嵌套安装。